There has been much discussion on this subject and the best answer is what works for you. Personally mine is 30% Protein, 30% Carbs and 40% Fat. (My fats are from whole foods like eggs, meat, nuts and olive oil.) Others will have success limiting fat to 20% or increasing Protein to 40%. Others that follow an Atkins type approach have success with very low carbohydrate intake. You will need to see what works best for you.

Here is what has worked for me:
*Eliminate or severly restrict simple carbohydrates like white bread, processed foods and sugar.
*Eat more vegetables and fruit.
*Keep protein at or above 30% of calories.
*Stop drinking your calories, except for some milk my beverages have little or no calories. Water is now my beverage of choice.

Happy retirement! Just wanted to repeat what Ron said - it's important to find out what works best for your body, and most of us have tried different combinations to see what works best. I'd be miserable on Ron's regime, and tend to feel best/recover easiest on ~50-55% carbs, 30% fat and 20% protein. Have fun learning what works best for you!